PHP text watermark and PHP image watermark Implementation code (two kinds of watermark method) _php Example

Text watermark

Text watermark is to add text on the picture, mainly using the Imagefttext method of GD library, and need font file. The effect chart is as follows:

The implementation code is as follows:

Copy Code code as follows:

$dst _path = ' dst.jpg ';

Create an instance of a picture
$DST = imagecreatefromstring (file_get_contents ($DST _path));

Make a text
$font = './SIMSUN.TTC ';//font
$black = Imagecolorallocate ($DST, 0x00, 0x00, 0x00);//Font Color
Imagefttext ($DST, 0, $black, $font, ' happy programming ');

Output picture
List ($dst _w, $dst _h, $dst _type) = getimagesize ($dst _path);
Switch ($dst _type) {
Case 1://gif
Header (' content-type:image/gif ');
Imagegif ($DST);
Break
Case 2://jpg
Header (' Content-type:image/jpeg ');
Imagejpeg ($DST);
Break
Case 3://png
Header (' content-type:image/png ');
Imagepng ($DST);
Break
Default
Break
}

Imagedestroy ($DST);

Picture watermark

Image watermark is to add a picture on another picture, mainly using the GD library imagecopy and Imagecopymerge. The effect chart is as follows:

The implementation code is as follows:

Copy Code code as follows:

$dst _path = ' dst.jpg ';
$src _path = ' src.jpg ';

Create an instance of a picture
$DST = imagecreatefromstring (file_get_contents ($DST _path));
$SRC = imagecreatefromstring (file_get_contents ($src _path));

Get the height of the watermark picture
List ($src _w, $src _h) = getimagesize ($src _path);

Copy the watermark picture to the target picture, and the last argument 50 is to set the transparency, where the translucent effect is achieved
Imagecopymerge ($DST, $SRC, ten, 0, 0, $src _w, $src _h, 50);
If the watermark picture itself has a transparent color, use the Imagecopy method
Imagecopy ($DST, $SRC, ten, 0, 0, $src _w, $src _h);

Output picture
List ($dst _w, $dst _h, $dst _type) = getimagesize ($dst _path);
Switch ($dst _type) {
Case 1://gif
Header (' content-type:image/gif ');
Imagegif ($DST);
Break
Case 2://jpg
Header (' Content-type:image/jpeg ');
Imagejpeg ($DST);
Break
Case 3://png
Header (' content-type:image/png ');
Imagepng ($DST);
Break
Default
Break
}

Imagedestroy ($DST);
Imagedestroy ($SRC);